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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60329498fd562af7dc419ca79401c2750a2404e8b992aa29d83d9f7b1e623957' 
  AND token = 'MbCapgKXhyuZKZ/aZM3Fou83nZp5LTB6LoKxmeOqaK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}